Like most way back when, I started tec as OC back mount. Did rebreather (too much $$$ for me to continue) and now sidemount. I wished there was something that could have taken me from point A to point B. So now many years later with the creation of Unified Team Diving you can start OC (back or sidemount) and progress to sidemount or back mount CCR. The gear is very similar all the way through so it allows you familiarity and simplicity (save money) as you increase your skills. Ya, I'm a fan and wished it was around when I started.